Well, it could be a good idea if you're interested in expanding your knowledge of visual storytelling and cultural expressions. Manhwa can offer unique perspectives and creative styles.
Well, having a crush on your teacher is a tricky situation. First, you should keep it to yourself. Teachers are in a position of authority, and acting on it could cause a lot of problems for both of you. Try to focus on the academic side of your relationship. Maybe engage more in class discussions about the subject matter to shift your focus from the crush to learning.